Grinding machine



May 6, 1930. I v o. DOYIUTT 1,757,175

GRINDING MACHINE Filed Sept. '7, 1927 a Sheets-Sheet 1 May 6, 1930. 7DOUTT 1,757,175

GRINDING MACHINE Filed Sept. 7, 192'? 6 Sheets-Sheet 2 o. DOUTT1,757,175

GRINDING MACHINE Filed Sept, 7, 1927 6 Sheets-Sheet 5 May 6, 1930. Y

0. DOUTT GRINDING MACHINE Maya, 1930.

6 Sheets-Sheet 6 Filed Sept. 7, 1927 Patented May 6, 1930 UNITED STATES;PA T OFFICE ownn DOUTT, on DETROIT, MICHIGAN, 'AssI'eNoR, BY, MESNEASSIGNMENTS, 'ro GEN- ERAL SPRING BUMPERCOBPORATION, A CORPORATION OFMICHIGAN eninnme MACHINE Application.filed september 7, 1927.1Seria1 Nb.217,951.;

This invention relates to grinders and more particularly to theprovision of a machine for grinding, polishing or buffing bars havingcurved surfaces such as the bars used in making up vehicle bumpers. Inthe following description and inthe claims the term grinding, isintended to' include polishing and butting since it will be apparentthat by merely applying an element of suitableabrasive'qualities to mymachine any oneiof these operations may beperformedthereon.

An object of the invention-is to provide a grinding for curved barswhich will be adapt-- ed to grind thereon a surface having asubstantially constant radius of curvature. Fur- Further and more limitedobjectswillbe apparent from the drawings and description, and from theuse of articles including the combinations of elements defined "in theclaims. V

Drawings Of the several drawings Figs. 1 and 2 show aside elevation andplan view, respectively,,of my grinder; F1g.'3 repr esents a sectionalview taken on line 33 of Fig. 2'a11d Fig.4 a front elevation of thegrinder; Fig.

5 shows an enlarged detailed viewof a portion of the mechanism foradjusting the height of the shelf upon which the feed wheel issupported; Fig. 6 is an enlarged detailed front elevation of thegrinding element and feed wheel and Fig.7 isa side elevation of thesame; Fig. 8 is a front fractional View of the lower portion ofthe feedwheel and the upper portion of the grinding element;

. Fig. 9 is a section through the center of the feed wheel; Fig. 10is adetailed fractional view of the mechanism for regulating the pressureapplied to the bars; Figs. 11, 12 and 13 show a side elevation, 21. planView and an end elevation, respectively, of a shelf adapted ingmechanismthereforg g to" support the feed wheel shaft'aiid-the Description Uponthe. base;1 are mounted standards 2, 3, 4 and 5,the motor 6"and theremovable bearing support 7. A grinding'or polishing element 8, ofsuitable abrasive'materi'al, is fixed tothe shaft9 which is rotated bythe motor 6 and supported onbearings carried by'thesupport andjthestandards '2, 3, 4;

and-,5. a

The bar feeding "drive'mechanism is sup a ported as a unit upon theshelf 10, said shelf having a laterally projecting portion 11extending-between the standards 3 and 4' from whichlongitudinalprojections 12 and 13 eX-' tend between standards 2 and 3andstandards 4 and 5,',respect ively. The shelf lO and its projectingportions providebearingsurfaces upon thestandards 2, 3, land 5 and isadapted to slide up and downt-hereon. The thread ed shafts .14, 14areffixed to the projecting p'ortions'1 2 and 13' and adapted to supportthe shelf 10. These shafts pass through blocks 15,15'within each ofwhich a gear 16, threaded to fit the threads of the shafts 14, isrotatably retained, as more clearly shown in Fig. 5. The shaft 17 hasfixed thereto worm gears-18, 18 adapted to rotate with said shaftand,'by means of the gears 16,16 and the shafts 14, 14, to raise andlower the shelf 10. The-handwheel lfi is fixed to the shaft l? tofacilitate the turning of the same. The plate 20,, fixed to the'shelf10, together with the plate 21 (Fig. 2) provide an extended bearingsurface upon; the standard 2, to prevent binding of the surfaces adaptedto slide upon the several standards. 7

The motor 22 is mounted on the shelf 10 and, through thetransmission 23,drives the shaft 24.' The gear is fixed to the shaft 24 and saidshaft,through the gear 25 and the idle gear 26, drives the ring theshaft;28.

The feed wheel 29 is fixed to the shaft 28 for rotation therewith butmay be removed from the end of that shaft and replaced by other feedmeans to handle bars of a different curvature or straight bars. Thiswheel is gear 27, keyed to 33. The nuts 36 on the rods 33 -andthesprings 37, between them and theplates35, exert the desired yieldablepressure uponthe shield 32; The I0(l '38,: connected'tdthe. end portionof the upper; rod 33 and the" upper plate 35 by means of an L shapedplate 39, is supported from the base 1 and serves to preventrotationi'of the shield-32 with'the shaft 28. The; shield 32 hasa Vshaped portion 40 cutout to permit contact between the bar be ing groundand the surface of' the grinding lementi8. Y i v a 3 ;In orderthatvariations in'the'thickness of thefbarsbeing ground may be allowedforand a uniform product may'result from I grinding bars of uneventhickness throughout their length, the resiliently supported wedges 41are adapted to press against and support the portions of the barsintermediatethe ends of the same. Asis clearly shownin FigJlO, the wedge41 has at its inner end a pin 42. The screw 43 is threaded into thewheel 29 and it, with the spring 44 between the pin 42 J and'thea'djacent end of the screw 43, exert an adjustable yielding pressureagainst the wedge 41. The slanting surfaceiof-the recess 45, cooperatingwith the slanting surface of the'wedge 41,- limits the outward movementof the'latter.

' Operation) I A grinding, polishing, orbufling element8,

of the desired abrasivequalities, is fixed upon shaft 9 for rotationtherewith; -Afeedwheel 29, ofsuitable diameter and configuration toreceive the bars 31, is fixed tothe shaft 28 for rotation therewith anda shield 32, of suitable configuration, is resiliently mounted upon theshaft 28. The shelf 10 is lowered until the desired contact is hadbetween the bars 31 on the feed wheel and the grinding element 8,

and the support 38 for the shelf 32 may be put in place. The grindingelement and the feed a wheel are then rotated in; the same direction(clockwise) and apair ofbars aresupplied to the recesses in the-feedwheel as shown in Fig. 6. The shield 32 will yield resiliently'to theoutward pressure from the surface of the bars 31 and will serve-tohold'them, in place against the whet-"3129.-

.By varying the pressure at the screws 43 and by;varying the distancebetween the feed w eeli29 n L egri d n l m n i th desiredpressure uponthe bars may be obtained.

The resiliently mounted wedges 41 will compensate for irregularities inthe bars and, by an increase of pressure due to increased compression ofthe springs 44, will cause greater grindingat the thicker portion of thebar and 7 thereby yield a bar of more nearly uniform thickness. i

It is apparent that the particular means shownifor holding the barsinplace on the wheel 29 are. not essential to my invention. It is alsoapparent that other driving and supporting means might be used withoutavoiding scope of the invention and it is not intended to hereby limitthe invention to the particular embodiment herein shown and described.7. f V It is intended that a pair of barsshould be applied to ,the.same'sectionof the periphery ofthe feed wheel atone time but one ormore than two maybe supplied if such operr.

' Having thus describ d my'invention, what I claim is: l i

. 1. Ina machine for a v the combination witha rotary grinding element,of'afeed wheel having; recesses in its periphery for ,therec eption ofthe end portionsof bars'to be ground, and means for regulating thepressure applied to the intermediate portions fof the bars,saidJmeansineluding resiliently supported plates adapted to press uponthe inner surfaces of the bars, and a segmental guide member having thesame curvature as said wheel, resiliently held adjacent the outerperiphery of said wheel and cooperating with said wheel to hold the barsthereon.

2. In a grinder the combination with a grinding element, a rotary feedwheel adapted to supply the workto the grinding element, means forcarrying said work upon the periphery of said feed wheel, said meansincludingrecesses onthe peripheral surface adapted to receive the endportions of the work, and a guide adapted to bear -upon the outersurface of the work, said guide being resiliently and radially supportedfrom a member arranged in concentric relation to the 7 center of thefeed wheel.

3. In a machine for grindingcurved bars, the combination with a grindingelement, of a shelf movably mounted relative to said grinding element, arotatable shaft carried by said shelf, a feed wheel mounted on saidshaft, means for supporting bars on the periphery of said wheelincluding means for engaging the ends of the bars on said wheel, and aguide memberyieldingly supported from saidshaft and of a curvaturecorresponding to the curvature 'of said wheel, said grinding curvedbars,

guide member cooperating with the means on said wheel tohold thework'thereon, said guide having. a cut-out portion on its outerperiphery into which the grinding element bars on said wheel, and achanneled guide member of the same curvature as said wheel, and in whichthe wheelrotates, said guide being yieldably supported from said shaftand spring means in the periphery of'said wheel for yieldably pressingthe bars against said guide member.

5. In a machine for grinding curved bars, a base member, a rotarygrinding element mounted on said base member, upstanding guide postssecured to said base, a shelf member slidably supported on said guideposts, a

shaft journaled on said shelf, a feed wheel carried by said shaft androtatable in the machine, the combination of means adapted to retainthe. ends of articles to be ground .or buffed, and resiliently actuatedmeans intermediate the: ends of said articles for resisting movementsthereof toward said wheel.

9. In a feed wheel for simultanenously supplying a plurality of curvedbars to a grindmeans for holding said bars adjacent the periphery ofsaid wheel, of resiliently actuated meansfor resisting movement of saidbars toward said periphery, said resisting means operating separately oneach bar,

10. In a feed wheel fora grinding or buffing machine, thecombinationwith means for retaining bars upon the surface of said wheel, of 'adustabIy resilient means for resisting movement of said bars toward saidwheel,'said resisting means comprising rests resiliently supported from"a base adj ustablymounted in said wheel, and means for Varying thecompression of the resilient support for said rest. 1 In testimonywhereof, I hereunto affix my OWEN DOUTT.

signature. I

plane of said grinding element, means for supporting the barsto beground on the periphery of said wheel including notches for thereception of the ends of said bars on said wheel, spring pressed membersarranged in the periphery of said wheel and a guide member cooperatingwith the means on said wheel,

said guide being ofchannel cross section in WhlCll the said wheelrevolves, sa d guide being of a curvature corresponding to thecircumference of the wheel and encasing the same for a material distanceagainst which the bars are yieldingly pressed, said uide'being supportedby means extending from the said shaft, means extending from said baseto prevent rotation of said guide on said shaft, and means for adjustingsaid shelf relative to said grinding element.

6. In a grinding machine for curved bar having eyes at their ends,the'combination with a rotary grinding element, of a rotary feed wheelhaving recesses in its periphery into which the eyes of the bars may bereceived, and resilient means for holding the bars onto said feed wheel,said means including spring means for urging said bar toward said wheel,and spring means for opposing said first spring means. V

7. In a grinding machine for curved bars, the combination with a rotarygrinding element, of a rotary feed wheel the periphery of which has thesame curvature as the bars to be ground, means on the periphery of saidfeed wheel for engaging the ends of said bars, spring means for engagingsaid bars to urge them toward said feed wheel, and spring means on theperiphery of said wheel against which said bars are yieldingl held.

8. In afeed wheel for a grinding or ufling ing or buffing machine, thecombination with I

